Delayed cut-off for inverted gas-lamps



R. D. SMITH.

DELAYED CUT-OFF FOR INVERTED GAS LAMPS.

APPLICATION FILED AUG. 7, 19m. RENEWED OCT. 4, 1920.

1,383,575, Patented July 5, 1921.

2 SHEETS-SHEET I.

R. D. SMITH.

DELAYED CUT-OFF FOR INVEBTED GAS LAMPS.

APPLICATION FILED AUG. I. 1916. RENEWED OCT. 4. 1920.

1,383,575. Patented July 5, 1921.

. 2 .SIIIEETSZHE 2; q

further actuation to'tension said closure.

. pending application,

UNITED STATES P ATENT RAYMOND 1). SMITH, OEMILTON:

IIIASSACHUSE'ITS,

' OFFICE,

ASSIGNOR, TO SHAWMUT MAINE.

' DELAYED CUT-OFF FOR INVERTED GAS-LAMIPS.

Application filed August 7, 1918, Serial No. 113,546.

1 0 all 107L072? it may concern Be it known that I, RAYMOND D. SMITH, a citizen of the United States, residing at Mih ton, in the county of Norfolk and State of Massachusetts, have invented certain new and userul Improvements in Delayed Cut- Ofls for Inverted Gas-Lamps, of which the following is a specification.

7 My present invention relates to delayed cut-offs for illuminating gas burners of the Bunsen type wherein light isproduced by theincandescence of a mantle or non-combustible fabric structure suspended from the lower and open extremity of a downwardly flaming mixing tube for the gas and air of the Bunsen burner, such types of burners being customarily attached to the usual gas bracket or chandelier by means of a goose neck extension pipe and, whether or not so attached, being commonly called inverted burners.

The objectof the invention is to provide in such an inverted, incandescent illuminating. gas burner and controlling valve arrangement, manually operable and partially automatic means for actuating the valve, adapted upon suitable actuation thereof, to open the valve for a continuous supply of gas to the incandescent burner, and upon valve for automatically delayed burner-extinguishing The time interval before such closure is then controlled by thermostatic means subject to the heat of anormally inactive, auxiliary burner tov which gas is supplied by thesame actuation that tensions said automatic actuating means. Such auxiliary burner is automatically ignited by a small, constantly burning pilot light (located exterior oi the shade holder canopy and substantially higher than the auxiliary burner) and thermally energizes the thermostat, releasing said automatic actuating means and causing thereby a quick-and posi tive closure of the valve and complete ex tinguishment of both main and auxiliary burners.

Theaccomplishment of such provision involves the solution of certain specific problems differing materially from those encountered in applying my novel valvecontrolling apparatus to other forms of burners, such for instance as that shown in my co- Serial Number 111,934.

Specification of Letters Patent.

Patented July 5, 1921. Renewed October 4, 1920. Serial No. 414,650.

These new problems arise primarily from the new condition (in the form of burner here concerned and. above described) that the bunsen, gas-and-air mixing tube delivers the air and gas mixture downwardly from the point of air inlet thereto, and accordingly must be, or customarily is, offset in relation to the chandelier arm or other supporting bracket. F or the same reason the valve control apparatus (preferably together with the before mentioned burner) must also be offset, or positioned beside the mantle burner as a whole, since it obviously cannot be positioned below the Bunsen tube as in the above mentioned application and cannot be superposed relative thereto be cause of the effect upon the governing thermostatof the intense heat arising from the. mantle burner.

in advantageous location for the valve and its automatic governing mechanism is. therefore, at the opposite end of the gas tube, commonly or" goose-neck shape, employed to support the entire illuminating burner. hen so located, however, there arises the problem of how to provide the necessarv operative relation between said auxiliary burner and the main burner so that the former may be automatically ignited at suit able times. The novel means herein provided accomplish this, and for the first time provide broadly for: the introduction of a constantly burning pilot flame arranged as a cooperating agent between the main and auxiliary burners and specifically so arranged as to ignite each or" these burners independently of the other when gas is supplied thereto. ln the disclosures of other arrangements in the applicants co-pending cases wherein a constantly burning pilot burner has been employed, the same has not been so cooperatively arranged that it alone could directly ignite the auxiliary burner regardless of whether the main burner were operating Constantly burning pilot lights have been heretofore used with inverted incandescent gas burners, in the form of a small conducting tube arranged to tap the main gas supply at a point aclr of. or on the supply side of, the local controlling valve. This pilot tube usually extends downwardly and terminates adjacent to the mantle of the main burner and within the chamber formed by the chimney for said mantle, so that the pilot burner or the main burner can be ignited each from the other, when said other is burning. Such form of pilot light is unsatisfactory for divers reasons, one of these being that, owing to, the general lack of rigidity characteristic of such structures, ac

cidental breakage of the mantle (which is very frail and brittle) is a frequent result of attempted installation, adjustment, or

even normal operation of the pilot light burner.

Accordingly, a particular object of my present invention is to provide a form of pilot light for an inverted incandescent gas mantle burner which shall be opera-tively related to the mantle burner to ignite the same but positionally remote from the mantle; and'which further, shall be so arranged as to be ignited by the usual operation of igniting the said mantle burner and 7 remain constantly burning independently of the controlling valve for said mantle burner, and to be suitably protected from accidental extinguishment by air drafts.

A further object of my lnvention isto so locate and construct a' partially closed chamber for the pilot light flame and to provide such gas conducting means, leading from the main burner chamber and from the auxiliary heating burner for the thermostat to said partially closed chamber for the pilot flame, that neither the explosive nature of the ignition of either of these two ing at the rear of'the valve, the main burner canopy structure being partially broken away or shown in section; Fig. 2 is a detail view of a modified form of certain gas conducting parts near the pilot light housing; Fig, 3 shows another possible and advantageous arrangement of gas conducting parts near the pilot light housing; Fig. 4: is a plan view of the structure shown in Fig. 1 taken in section on the plane 4l,4c in 3 that figure; Fig.

5 is an enlarged partial section taken on the plane 5-5 in Fig. 1, showing the arrangement of valve ports and their relative positions during normal operation of the main illuminating burner; Fig.

6 is a section similar to Fig. 5, but showing a different relation of ports; Fig. 7 shows the relation of valve ports when the light has been extinguished; Fig. Sis a front elevation of the valve controlling mechanism, showing the position of parts after automatic closure of the valve; Fig. 9 is an elevation looking at the left of Fig. 1, with the goose-neck extension pipe and certain other parts broken away; Fig. 10 is a view similar to Fig. 8, but showing the position of the valve controlling mechanism after .manual operation of extinguishing means and before automatic closure of the valve or while the thermostat is being heated, and also showing'the pilot burner and the ;upwardly slanting ignition tube for conducting gas from the auxiliary heater burner thereto.

Similar and corresponding parts are indicated throughout the drawings and designated in the following description by the same numerals.

' Referring to Fig. 1, particularly, the illuminating mantle appears at 1, and is of the conventional type suspended at its upper and open portion, by means of a flange 2 of refractory material, said flange having the usual inwardly projecting supporting lugs adapted to seat on shelved recesses in a bracket terminal 3, ofrthe vertical supporting stem and mixing chamber 4. for the gas and air of the main Bunsen burner. At the top of the mixing'chamber 4 is shown the usual gas injector and air intake construction wherein adjustment of the gas sup- P y wardly pointing needle valve plunger 6 and the conically pointed screw 7, and wherein adjustment of the air openings 8 in the wall of the mixing chamber may be had by rotary adjustment of the circular shield 9 which latter has corresponding openingsl0 that may be made to register with the openings 8, such Bunsen gas burner construction being well known in the art. 7

may be had by means of the down-' The combined mantle supporting stem and mixing chamber 4: terminates above the Bunsen gas injector construction inan in- I ternally threaded portion 11 and is mounted this portion upon a goose-neck extension p1pe ,5. {it its other and lower end, this extenslon pipe is mounted upon a valve block 12, which latter at its bottom, has an internally threaded portion 1 1, by means of whichthe entire structure may be mounted upon the usual gas bracket or chandelier. The mixing chamber l is structurably integral with apunched metal dome or canopy structure 13 arranged to receive and hold an outer glass shade 17; c 1

Interior of the chamberformedby said canopyand shade, an inner chimney 16, open at the top, is suspended from a shelf formation of the canopy, and surrounds the mantle.

The valve block contains the usual rotary tapered valve plug 15 whose axis lies transverse of the main gas passage 18, through sa d'block, and which when rotatively actuated by mechanism to be described herein- Cir rises to the highest top, this ignition that the hood 42 after, controls the supply of gas to both the main burner stem 4 and to a small auxiliary Bunsen burner 21 that is located in a bracket extension 22, of the valve block. Adjustment of the supplyof gas to the burner 21 may be had by the screw 23.

'In another bracket extension 24' of the valve block 12, an upwardly slanting gas port 27 is shown leading from the main gas passage, below the valve plug 15, to the base or" an upwardly slanting tube 25 whose top orifice is partially inclosed by a pilot flame protecting cage or lantern chamber 28 fixed to the canopy structure. This cage as shown is cylindrical and has mica covered openings 24 in its wall. Gas supply to the pilot tube may be controlled by the adjusting screw 26. It will be evident that, when ignited, the small flame 29 at the top of the tube (commonly called a pilot light) will remain constantly burning independent of the valve plug 15. This flame is so situated as to ignite the mantle ever gas is supplied to the latter, in a manner which I shall now explain.

Illuminating gas, having a lower specific gravity than air, tends to rise, and therefore upon emission from the'lower outlet of the Bunsen mixing chamber 4, and before being ignited, such gas immediately portions of the canopy structure 18. Accordingly it is customary to light this type of illuminating burner at a large opening 40 in. the canopy structure, such opening also providing an outlet for the intense heat rising from the mantle burner during its normal operation;

At a high portion ofthe canopy, therefore, T have provided an opening 41. The canopy shell, about the edges of this opening, extends upwardly for receiving thereupon the bottom, cylindrical portion of a den1ou:-table gas ignition hood 42. At the hood is cut and bent to form a'curved, inverted trough-shaped extension lying substantially horizontal and partially 'over'the protecting cage for the pilot flame 29, so. as to eflectively guide and sutiiciently direct the out-coming gas toward the pilot flame that such gas may be ignited by said flame; However it should be noted forms very little inclo'sure of the gas in the neighborhood of the pilot flame, and that the horizontal terminal of this hood is acutely beveled and otherwise shaped to purposely preventsuch inclosure and to allow unconstricted communication with, and access offree air at the place of ignition. The ignition of the considerable volume of gas that has issued from the main burnerafter opening the valve, is practically instantaneous throughout, andtherefore of an explosive nature. Such explosive effect would be sufiicient to extinguish the flame, were the latter directly in line with burner whennism is afforded 66 to the broken line pilot the outlet orifice of the delivery hood, or if both said pilot flame and orifice were inclos'ed within a chamber providing little communication with the outside air. I have also shown a shield 43, in Figs. 1 and 4, which, together with the walls of the canopy, forms, in effect, an inverted funnel arranged to collect the gas rising from the main burner and to deliver the same through the ignition hood 42 more efficiently than would be possible without such shield.

This pilot-light, gas igniting arrangement does not necessitate a separate or unusual operation for igniting the pilot burner, when for any reason the latter has become extinguished, since such ignition of the pilot burner is automatic and occurs upon ignition of the main mantle burner at the opening 40 in the usual manner. The cause of such automaticignition of the pilot burner lies also in the nature of the ignition and inflammation occurring throughout the volume of gas which plying the match or other igniter. Such volume of gas extends to and includes that gas escaping from the pilot burner so that the latter is ignited simultaneously with the main mantle burner.

In Fig. 2, I have shown an auxiliary and smaller, inverted, trougl1shaped extension 44 contained within and fixed to the delivery hood. lVithout making the pilot flame 29 more susceptible to the explosive disturbance of the gas ignition, such auxiliary extension may cause more immediate and rcliable delivery of the rising gas to such pilot flame and thereby quicker ignition of the main burner when gas is supplied thereto.

Fig. 3 shows another possible means for obtaining quicker ignition of the main burner if desired. A small gas conducting tube 45 is shown, terminating adjacent to the orifice of the pilot light burner and extending downwardly into the canopy chamber where it spreads into a collecting shield for the rising gas. A short path for the gas from the canopy chamber to the pilot flame 29 is thereby afforded and such gas issuing from said tube will burn, thus increasing the size of the pilot flame 29 and causing more ready ignition of the gas delivered through the ignition hood 42.

Referring particularly to Figs. 4, S, and 10, I shall'now describe the mechanism by which the movement of the valve plug 15 is controlled. Manual control of this mechaby the chains and 68. A downward pull on chain 68 in Fig. 8 first swings the spring actuated latch lever posit-ion thus disengaging it from the locking projection 78 of the vertical, circular supporting plate 31, which supporting plate is fixed to the valve block 12. The latch lever is pivoted to one end of the double-ended control lever has collected before ap-' which is loosely and pivotally mounted on a stem extension of the valve plug 15 a 1d its other end carries the chain 65. Further pull on the chain 68 will therefore swing the control lever to its position indicated by broken lines in Fig. 8, where it will be stopped by engagement wit an other projection 5a of the supporting plate. 31. During this movement, the valve plug has been positively rotated a corresponding amount by. engagement of the control lever with a rearwardly bent extension 37 of .the dog member 36, the latter being fast Fig. 16 it will be seen that during thislatter the heater member, 40

. heater member movement, the dog member 36 has been in tercepted 1n an intermediate positlon and that it is held in this position against the tension ofspring 38 by a spur shaped projection 52 carried fast to the inner surface of the curved bi-metallic thermostat 53. r

The thermostat 53 is mounted atone end to the projection 5et'of the supporting plate 31 and is clamped thereto in surface contact with the base of an upwardly extending heater member 56 by screws 55, 55. The 56 terminates in a. hollow hoodedportionz57 thatfis perforated at its top and is positioned directly over the auxil-v iary burner 21. I

Directly above this hooded terminal of is the lower end of an ignition chimney tube 32 which tube slants upwardly and is entirely open at both ends. This ignition tube is. fixed to the outer canopy shell and its higher end falls directly beneath and slightly below of 1 the pilot flame protecting cage. The lower end of the tube encompasses the perforated top of the heater hood, but leaves a free passage for air into said tube around the exterior of the hood. Gas, rising from the auxiliary burner 21 and through the opening in the top of the heater hood, is guided upwardly through the chimney tube 32 into the pilot light cage, and upon igniting fromthe pilot flame. flares back through said tube, subsequently burning with a blue p flame at the top of the burner 21 only, and

under the hood'57 as shown in Fig. 10.

A loose, stationary roller is mounted on a stud projecting from the support plate 31 and engages the inner surface of the thermostat to help the thermostat bear the load of the tensioned dog member This dog member engages the thermostat spur 52 by means of a spring actuated latch 4L6 pivoted to the dog'inember at a7 and capable of 'ment, after which the open bottom yielding in one direction only, namely counter-clockwise in Fig. '7, or when passing the spur 52 by clockwise rotation of the dog member 36. A casing 33 is provided. for the valve mechanism. Y

Having thus described the controlling mechanism I shall nowexplain the operation of the complete'burner and Valve arrange- I shall point out what constitutes the novel features of my invention in theappended claims.-

Starting from the position vof parts as shown by broken lines in Fig. 8, where the valve ports are related as in Fig. 5 and where the main mantle burneris lighted and adapted for continuous operation, when it be desired to extinguish the light, control chain 68 is pulled downwardly which moves the parts to the' position indicatedin :Fig. 10,. where the valve ports are related as shown in Fig. 6. It willbe seen that the small port 19 in the valve'plug now registers vwith the corresponding port 20 leading to the auxiliary burner 21 inthe valve block and that gas is thereby supplied which is then ignitedfrom the pilot fiame29, as heretofore explained, the supply of gas to themain mantle burner having been substantially unaltered by movement of the valve plug. .The

flame of the auxiliary burner now plays a ainst the hooded terminal 57 of the'heater I c a I n member 56 as shown in Fig. 8, which latter member conducts heat from said flame to the thermostat. The thermostat uponbeing thus heated, straightens, orbends generally outi'vardly, assuming the-lbrokenline posi tion indicated in-Fig. 10 after a certain ime. interval, whereupon the spur 52 releases the dog member 36 and the latter is immediately impelled by the spring 38 to the position asshownin Fig. 8, :where the relation of valve ports is as shown inF-ig. T, and all gas supply to both the auxiliary heater burner and to the main mantle burner has been .cut off. The pilot flame 29, however, remains burning and when gas is again supplied to the main. mantle burner, ignites the latter as heretofore explained. V

The valve maybe opened again'at will for supplying gas to the main mantle burner by pulling downwardly on chain 68; This restores the valve plug to'the position shown in Fig. 5as before explained. It should be noted that in this, position, no gas is supliedto the auxiliary burner21 and that the main mantle is adaptedto. remain in operation for an indefinite period of time.

Other variations of the precise illustrated or described embodiment of-my invention will be readily apparent to those skilled in the art ;and without therefore limiting myself to that embodiment, what I claim as my inventionis:'

1. The combination, in an inverted mantle gas lamp,having a gas conductive goose V 25 by said flame.

neck connecting the same. with a laterally located fuel control valve and embodying a downwardly directive Bunsen tube for the gas and air mixture arranged with an air inlet near the top'thereof and an outlet for the fuelmixture at its bottom end whereat is suspended the illuminating,1nantle,of an auxiliary burner at the valve end of said goose neck connected to be also governed as to fuel supply by said valve and constituting -part of automatic agencies for controlling closure thereof; a pilot burner constantly supplied with gas independently of said valve, positioned intermediate said Bunsen tube outlet and said auxiliary burner and :at a higher level than either means for collecting gas issuing respectively from the said Bunsen tube outlet and from said auxiliary burner; said means being arranged to direct said gas into common proximity to the-flame of the pilot burner, so that either said mantle burner or. said auxiliary burner when supplied with gas is ig- 'nitible independently of the other directly 2.. An inverted mantle gas burner arrangement having a mixing chamber for the gas and air of the mantleburner with a fuel outlet at the lower end thereof cooperating with the suspended illuminating-mantle, and including in combination, a valve controlling the supply ofgas to said mixing chamber; a normally inoperative, auxiliary, heating burner; a pilot burner positioned to ignite both said mantle burner and said auxiliary 5 burner and arranged to be constantly supplied with gas independent of said valve; manually operable, automatically acting mechanism, operatively related to said valve 40 and arranged to govern the flow of gas to said auxiliary burner, said mechanism 111- cluding a controlling thermostat adapted to:

be subjected to the heat from said auxiliary burner and thereby to be made operative to cause a movement of said valve.

3. ment, having a mixing chamber for the gas and air of the mantle burner with a fuel outlet'in the lower end thereof cooperating with the suspended illuminating mantle; and including,in combination, a valve controlling the supply of gas to said mixing chamber;

a normally inoperative, auxiliary heating burner; a pilot burner a protecting cage, and arranged to be constantly supplied with gas independent of said valve; gas conducting means arranged toydeliver'gas from' the-mantle burner into' igniting relationwitlrsaid pilot burner gas conducting means for delivering 7 gas from said auxiliary burner. into igniting relation with said pilotburner; and, manually operable, automatically acting'means operatively related tosa'id valvefand arranged 55 the flow of gas to said auxiliary burner, said a protecting cage, and

; and separate An inverted mantle gas burner arrangethe fuel outlets in both of partially inclosed byf tot'govern means includin a controlling thermostat adapted to be so jected to the heat from said auxiliary burner and thereby made operative to cause a movement of said valve.

4:; An inverted mantle gas burner arrangement, having a mixing chamber for the gas and air of the mantle burner with a fuel outlet at the lower end thereof cooperating with the suspended illuminating mantle; and including, in combination, a valve controlling the supply of gas to said mixing chamber; a normally inoperative, auxiliary, heating burner; a pilot burner partially inclosed by arranged to be constantly supplied with gas independent of said valve; gas conducting means arranged to deliver gas from the mantle burner into igniting relation with said pilot burner; gas conducting means for delivering gas from. said auxiliary burner into igniting relation with said pilot burner; and manually operable, automatically acting means operatively related to said valve, and arranged to govern the flow of gas to said auxiliaryburner, said means including a controlling thermostat and a heat receiving and conducting member extending from said thermostat to the flame of the auxiliary burner, whereby the thermostat may be thermally energized and thereby made operative to cause a movement of said valve.

5. An inverted mantle gas burner arrangement embodying, in combination; a mixing chamber for the gas and air of the mantle burner mounted at one end of a gas conducting, gooseneck, extension pipe, said mixing chamber having a fuel outlet at its lower end cooperating with the suspended illuminating mantle; a valve at the other end of said extension pipe adapted to control the supply of gas to the mantle burner; a normally inactive, auxiliary, heating burner structurally associated with said valve; a pilot burner operatively associated with said mantle burner and withsaid auxiliary burner, positioned substantially higher than said burners, and arranged to be constantly supplied with gas independent of saidvalve, and manually operable, automaticallyacting mechanism, operatively related to said valve and arranged to .governthe flow of gas to said auxiliary burner, said mechanism including a controlling thermostat adapted'to be subjected to the'heat from said auxiliary burner thereby to be made operative to cause a movement'of said valve.

6. An inverted mantle gas bur'ner'arrangement embodying, in combination; a mixing chamber for the gas and air of the mantle burnermountedat 'oneend of a gas conducting, gooseneok, extension pipe, said mixing chamber having a fuel outlet at its lower end cooperating'with the suspended illuminating mantle; a valve at the other end of said extension pipe adapted to control the supply active; auxiliary,

'm'e'ans arranged ,gulde unburned gas issuing of gas to the mantle burner; a normally inassociated with said valve; a'pilot burner oartiall inclosedb a rotectin ca e and arranged to be constantly supplied with gas independent of said valve; gas conducting to guide unburned gas, ISSUE' ing from said mantle burner into igniting relation with burner;-gas conducting means arranged to burner 1nto igniting relation with the ary and manually heat from said pilot burner;

operable automatically acting mechanism; operatlvely related to said valve and arrangedto govern the flow of gasto said auxiliary burner, said mechanism including a controlling thermostat'adapted tofbe subjected to the heat from said auxiliary burner thereby to be made operative to'cause a move r ment of said valve.-

7. An inverted gas mantle arrangement embodying in combination; ajmixing chamber for the gas and air of the mantle burner mounted at one end of a gas con-ducting,

gooseneck, extension pipe; said mixing chamber havlng a fuel outlet at its lower endcooperating with the suspended illuminating "mantle, both said outle'tand said mantle being 7 contained within a canopy covered chamber having'openings in its upper portion for the escape 'of heat; a pilot burner encompassed by a protecting cage having openings at the top and bottom thereof and arranged to be constantly supplied with gas independent'of said valve, a gas delivery hood cooperating with an opening in said canopy to deliver unburned gasth erefrom- 'inproximity to said cage in thepresence of tree'air and into igniting relation with the heat from sa d pilot burner; a gas conducting tube arranged to receive unburned gas I issuing from said auxiliary burner and to "deliver the same in the presence of treeair and into igniting in proximity to said' cage relation with the heat from said pilot burner; and manually operable, automat1- cally acting mechanism, operatively related to said valve and arrangedto govern the flow of gas to said auxiliary burner --said mechanism including a controlling thermostat adapted to be subjected to the heat from said auxiliary burner; thereby to be made operative to cause a movement of said valve.-

'8. An inverted gas mantle arrangement embodying in combination; a mixing chamv her for the gas and air of the mantle, burner suspended at one end ofa gasconducting, gooseneck, extension p1pe, sald mlxmg chamberhavlng a fuel outlet at its lower end cooperating with the'illuininating' mantle;

both said outlet and said mantle being con tained Within a canopy covered chamber hav- 1 heating burner structurally the heat from said pilot from said auxiliing openings in itsupper cape of heat; apilot burner encompassed by a protecting cage having openings at the top and bottom thereof and arranged to be con-' stantly supplied with gas r independent of said valve, a gas delivery hood cooperating with an opening in said canopy to deliver unburned gas therefrom in proximity to said cage in the presence of free air and into igniting relation with the heat from'said pilot burner; a gas conducting tube arranged to receive unburned gas issuing imity to said cage in the presence ofiree air and into igniting relation with the heat from saidpilot burner; and manually operable,

automatically acting mechanism, operatively related to said valve andarranged to govern the flow of'gas to said auxiliary burner said mechanism including a controlling thermostat andaheat receiving and condueting member extending from said thermostat and terportion for the es-i from said auxiliary burner and to deliver same 1n proxminating in a"hollow;.ho.od&shaped portion,

perforated at the; top, andpositioned directly over said auxiliary burner and directly beneath the lo wer end of said gas conductingtube for the gas from saidauxiliary burner; whereby the thermostat may be thermally energizedand thereby;- made op} erative to cause a movementbf said'valye.

9. An ln verted gas mantle arrangement embodying in combination a mixing chamber for the gasan-d a1r of the mantle burner suspended at one end ofa gas conducting, gooseneck, extension pipe, said mixing chamher having a fuel outlet at its lower end cooperating'i'vith the illuminating mantle, both said outlet and said mantle being contained within a canopy covered chamber'havmg' openings in its upper pOrtionjfor the escape 'of heat; a pilot burner encompassedby aprotecting cage in the presence of free air andinto ignit-' thereof and arranged to be con gas 1ndependenti of through said delivery hood directly over said ing relation with the heatfrombaid pilot burner; a-gas conduit arranged to receive unburned gas from said auxiliary burner and to deliver the same "directly undersaid cage in the presence of free air and into-igniting relation with the heat" from said pilot burner; and manually operable automati-V' cally acting mechanism operatively related to a valve for the mainand auxiliary burners; said mechanisms including a controlling thermostat adapted toybe' subjected to the heat from said auxiliary burner and thereby to be made operative to cause a movement of said valve.

10. In a Bunsen gas burner arrangement embodying a main burner mixing tube for the gas and air with the fuel inlet at the upper end thereof and a burner outlet for the fuel therebelow, together with a valve controlling the supply of gas to said mixing tube, and positionally remote therefrom, in combination; automatic, thermostatically controlled means operatively related to said valve, comprising a normally inactive auxiliary heating burner with a gas supply therefor, independently governable by a partial movement of said valve, and a controlling thermostat, adapted to be subjected to the heat of said auxiliary burner and thereby to be made operative to cause a movement of said valve; and a pilot burner arranged to be constantly supplied with gas independent of said valve, so cooperatively positioned relative to the said auxiliary burner that the pilot burner is rendered directly operative to ignite the auxiliary burner independently of main burner operation. V

11. In a Bunsen gas burner arrangement embodying a main burner mixing tube for the gas and air with the fuel inlet at the upper end thereof and a burner outlet for the fuel therebelow, together with a valve controlling the supply of gas to said mixing tube and positionally remote therefrom, in combination; automatic, thermostatically controlled means operatively related to said valve comprising, an auxiliary heating burner with a gas supply therefor governed by said valve; and a controlling thermostat, together with a heat conducting member extending from the latter and terminating over said auxiliary burner in a hollow, hoodshaped portion perforated at the top, and adapted to be heated by the flame of such auxiliary burner-and to conduct such heat to the thermostat whereby the latter shall be made operative to cause a movement of said valve; and a pilot burner arranged to be constantly supplied with gas inde Jendently of said valve, and so cooperative y positioncd relative to the said auxiliary burner that automatic ignition of the latter may be caused by said pilot burner.

12. A pilot light arrangement for inverted mantle gas lamps embodying in combination with the downwardly flaming main burner and mantle suspended therebelow, a canopy constituting the upper covering of the main burner combustion chamber; a pilot burner adjacently exterior of said canopy; and gas directive means disposed upwardly from an opening in a high portion of said can0py,-ineluding a horizontally disposed hood extending laterally from above said opening to a point proximate and above the flame of said pilot burner thereby to check the upward stream of gas issuing from said canopy through said opening and cause the same to be diffused proximate the flame of said pilot burner.

13. A pilot light arrangement for inverted mantle gas lamps embodying in combination with the downwardly flaming main burner and mantle suspended therebelow, a canopy constituting the upper covering of the main burner combustion chamber; a pilot burner adjacently exterior of said canopy; and gas directive means disposed upwardly from an opening in a high portion of said canopy, including a horizontally disposed hood extending laterally from above said opening to a point proximate and above the flame of said pilot burner thereby to check the upward stream of gas issuing from said canopy through said opening and cause the same to be diffused proximate the flame of said pilot burner; together with a lantern chamber, open at the top and bottom, positioned to surround and partially inclose said pilot burner.

Signed in Boston, Massachusetts, this 5th day of August, 1916.

RAYMOND D. SMITH.

Witnesses:

E. L. MGFADDEN, JAMES D. GonDoN. 

